Influence of composition on the morphology of primary Cu6Sn5 in Sn-4Cu alloys

McDonald, Stuart, Nogita, Kazuhiro, Read, Jonathan, Ventura, Tina and Nishimura, Tetsuro (2013) Influence of composition on the morphology of primary Cu6Sn5 in Sn-4Cu alloys. Journal of Electronic Materials, 42 2: 256-262. doi:10.1007/s11664-012-2222-3


Author McDonald, Stuart
Nogita, Kazuhiro
Read, Jonathan
Ventura, Tina
Nishimura, Tetsuro
Title Influence of composition on the morphology of primary Cu6Sn5 in Sn-4Cu alloys
Journal name Journal of Electronic Materials   Check publisher's open access policy
ISSN 0361-5235
1543-186X
Publication date 2013-02
Year available 2012
Sub-type Article (original research)
DOI 10.1007/s11664-012-2222-3
Volume 42
Issue 2
Start page 256
End page 262
Total pages 7
Place of publication New York, NY, United States
Publisher Springer
Collection year 2013
Language eng
Formatted abstract
Alloys from the composition range Sn-(0.7 wt.% to 7.6 wt.%)Cu consist of
primary Cu6Sn5 surrounded by a eutectic Sn-Cu6Sn5 mixture. The primary
Cu6Sn5 intermetallics commonly adopt a coarse elongated morphology, which
is not optimal for the mechanical properties of the soldered joint. This paper
investigates the effect of trace elemental additions on the size and morphology
of the primary Cu6Sn5 in Sn-4 wt.%Cu alloy with and without Ni additions.
Elements investigated include ppm additions of Al, Ag, Ge, and Pb. It is shown
that Al has a marked effect on the solder microstructure and refines the size of
the primary Cu6Sn5, even at very low addition levels, in both binary Sn-Cu
alloys and those containing additional Ni. The effect of Al is confirmed using
real-time x-radiographic synchrotron observations of solidification.
Keyword Lead-free solder
Cu6Sn5
Grain refinement
Solidification
Synchrotron
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 5 September 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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